REP15015

• Permit No: C1981044
• IBM Index Class Name: Report
• Doc Date: 6/3/2005
• Doc Name: 2004 AHR Response Part 2
• Annual Report Year: 2004
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

RAG
Mine Water
- ,
Yampa liivtr\
y
Water Quality Sample
Site WF-2
Wiliam Fork River
Study Area
Assessment
rte' ~i `
.
y \W atcr Quality Sample
4~l Site WF-1
CO-0034142
WilliatrtS Fork Mining Co. (COG500062)
Q--__ RAG Empitt Coal Co. Eagle
Mirx WWTP (000034142) ~~ .-
~ _
LEGEND
State ~ Military Area
-- County i~$National Park
~ Lake/PbndJOCean ~ Oiher Park
-- Expressway City
--Highway - County
Connector
~ Stream
10 i! t2 i3 ~4 13 t6 nt
Scale 1:208221 r-12 ~~'-t'e~le kn
~a~erage--true sesla depends on taoni tor'~resoltrtion
-- Source: US Census Tiger Mapping Server
The combined design flow from Outfalls 003, 022 and 024 is 4.03 MGD (6.2 cfs); the design flow
for Outfa11023 is 0.012 MGD (0.019 cfs). The ratio of the low.flow of Williams Fork ltivei to the:
design flow of the Eagle ivline discharges is 3.2:1 at low flows.. Nearby facilities were not found to
impact the assimilative capacity calculations in this assessment. However, due to the small available
dilution and high in-stream ambient water quality concentrations for sortie pazameters, analyses
indicate that assimilative capacities aze relatively limited for several pollutants.
Information used in this assessn-,ent includes data gathered from the RAG Empire Corporation, the
Division ofMinerals and Geology, and the U.S Geological Survey. The data used in the assessment
consist of the best information available at the time of preparation of this WQA package.
II. Water Quality
The Eagle Mine dischazges io the Water Body Identification (WBID) stream segment COLCLY13b,
which means the Lower Colorado River Basin, Lower Pampa River Subbasin, Stream Segment 13b.
Appendix A Page 2 of 13